TravelCheck-in - The Travel Guide | 01.10.201610/04/2016October 4, 2016Cologne is known for its cathedral, the Rhine and its carnival. Plus, the infectious good humor of its residents. What's behind it? Check-in presenter Nicole Frölich soaks up some of Cologne's inimitable exuberance. https://p.dw.com/p/2QqPcAdvertisement